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Underwater computer

  • US 4,658,358 A
  • Filed: 06/13/1984
  • Issued: 04/14/1987
  • Est. Priority Date: 06/13/1984
  • Status: Expired due to Fees
First Claim
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1. Apparatus for carrying by a diver while under water (and at the surface between dives) and for providing information useful for enabling the diver to ascend therefrom both expeditiously and safely in order to avoid decompression sickness, comprisingtransducer means for providing an electrical capacitance responsive to the pressure of the water thereon,electronic circuit means comprising a resistance means in circuit with the transducer capacitance means for providing a signal responsive to the time constant therein and substantially unaffected by normally encountered variations in supply voltage,electronic data processing means, responsive to the signal from the resistance-capacitance circuit means, for computing the water pressure, the depth of the transducer capacitance means in the water, the minimum depth to which the diver can from there ascend safely, and the minimum time within which the diver then can ascend safely to the surface of the water, andmeans for providing indications perceptible to the diver of the computed values,the size, shape, and composition of the transducer capacitance means and the characteristics of the circuit, data processing, and indication providing means being such as to draw substantially less than ten milliamperes in total current, and thus to assure long usable life of the source of the current for the apparatus and essentially negligible magnetic influence on the surroundings.

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